# Latest **URL:** https://forum.loinc.org/latest.md [Latest](https://forum.loinc.org/latest.md) · [Categories](https://forum.loinc.org/categories.md) · [Tags](https://forum.loinc.org/tags.md) --- ## [Seeking examples of Lab Order Messaging (HL7 v2.x, v3, FHIR) between any sources](https://forum.loinc.org/t/seeking-examples-of-lab-order-messaging-hl7-v2-x-v3-fhir-between-any-sources/3122)
**Author:** [@pdbanning](https://forum.loinc.org/u/pdbanning)\ **Replies:** 0\ **Last updated:** [July 30, 2026, 8:10pm UTC](https://forum.loinc.org/t/seeking-examples-of-lab-order-messaging-hl7-v2-x-v3-fhir-between-any-sources/3122 "2026-07-30T20:10:24Z")
Stan Huff and Jim Case are looking for example messaging in order to help plan the modeling on SNOMED International’s side of the LOINC SNOMED CT Ontology. I don’t believe they were specific as to the source or recipien… --- ## [README: Welcome to LOINC Community Forum! 👋](https://forum.loinc.org/t/readme-welcome-to-loinc-community-forum/5)
**Author:** [@system](https://forum.loinc.org/u/system)\ **Replies:** 0\ **Last updated:** [July 6, 2023, 4:00am UTC](https://forum.loinc.org/t/readme-welcome-to-loinc-community-forum/5 "2023-07-06T04:00:00Z")
We are so glad you joined us! LOINC Community Forum This forum exists to empower members of the extensive LOINC community to ask questions of and collaborate with their fellow LOINCers. Looking back This is the succe… --- ## [Delafloxacin naming issue](https://forum.loinc.org/t/delafloxacin-naming-issue/3148)
**Author:** [@ibloise](https://forum.loinc.org/u/ibloise)\ **Replies:** 2\ **Last updated:** [September 22, 2026, 3:40pm UTC](https://forum.loinc.org/t/delafloxacin-naming-issue/3148 "2026-09-22T15:40:27Z")
Hi everyone, I would like to raise a naming issue that we identified while reviewing a recent submission. Current LOINC codes related to delafloxacin use ABT492 as the Component name. ABT492 was the development name fo… --- ## [Term request timeline](https://forum.loinc.org/t/term-request-timeline/2938)
**Author:** [@aostropolets](https://forum.loinc.org/u/aostropolets)\ **Replies:** 1\ **Last updated:** [September 22, 2026, 2:08pm UTC](https://forum.loinc.org/t/term-request-timeline/2938 "2026-09-22T14:08:15Z")
What are the usual term request processing timelines? I see that there is a lot of variation with some requests being processed in under a week and others taking years. At which point should I give up waiting and go with… --- ## [Authentication issue (Excel PowerQuery)](https://forum.loinc.org/t/authentication-issue-excel-powerquery/3079)
**Author:** [@deckmm](https://forum.loinc.org/u/deckmm)\ **Replies:** 14\ **Last updated:** [September 21, 2026, 2:35pm UTC](https://forum.loinc.org/t/authentication-issue-excel-powerquery/3079 "2026-09-21T14:35:18Z")
Hi, I’m trying to pull a subset of LOINCs into Excel by attempting to connect PowerQuery to one of the APIs. I’ve tried everything I can think of, but I simply can not get authentication to work within Excel. If I pa… --- ## [Reporting Blood Cultures](https://forum.loinc.org/t/reporting-blood-cultures/3149)
**Author:** [@rmerrick](https://forum.loinc.org/u/rmerrick)\ **Replies:** 0\ **Last updated:** [September 17, 2026, 4:43pm UTC](https://forum.loinc.org/t/reporting-blood-cultures/3149 "2026-09-17T16:43:01Z")
The LabMCoP is working on the best way to report blood cultures (last notes on this topic are here: https://aphlinformatics.atlassian.net/wiki/spaces/LMCOPL/pages/5354488134/2026-09-17+LabMCoP+Meeting+Notes) - both the r… --- ## [LOINC Terminology Service maintenance on 25 Sept 2026](https://forum.loinc.org/t/loinc-terminology-service-maintenance-on-25-sept-2026/3143)
**Author:** [@system](https://forum.loinc.org/u/system)\ **Replies:** 0\ **Last updated:** [September 10, 2026, 6:13pm UTC](https://forum.loinc.org/t/loinc-terminology-service-maintenance-on-25-sept-2026/3143 "2026-09-10T18:13:23Z")
This is to alert you of an upcoming system maintenance window regarding the LOINC Terminology Service using HL7® FHIR®. The service will be unavailable on Friday, 25 September 2026 from 8:00 to 10:00 p.m. EDT. We apologi… --- ## [LOINC code for Liver Cancer BCLC Stage](https://forum.loinc.org/t/loinc-code-for-liver-cancer-bclc-stage/3061)
**Author:** [@pbuluschek](https://forum.loinc.org/u/pbuluschek)\ **Replies:** 2\ **Last updated:** [August 31, 2026, 1:16pm UTC](https://forum.loinc.org/t/loinc-code-for-liver-cancer-bclc-stage/3061 "2026-08-31T13:16:58Z")
In liver cancer (hepatocellular carcinoma, HCC), a disease stage assessment called BCLC (Barcelona Clinic Liver Cancer) staging is used, with possible values of 0, A, B, C, and D. When recording that in a FHIR database, … --- ## [LOINC 2.83 Drug Tox Screen and Confirm](https://forum.loinc.org/t/loinc-2-83-drug-tox-screen-and-confirm/3134)
**Author:** [@js050784](https://forum.loinc.org/u/js050784)\ **Replies:** 1\ **Last updated:** [August 28, 2026, 4:48pm UTC](https://forum.loinc.org/t/loinc-2-83-drug-tox-screen-and-confirm/3134 "2026-08-28T16:48:58Z")
With the release of 2.83 I’m still seeing a large volume of LOINC codes that are not discouraged in the Drug/Tox class that have a method of either Screen or Confirm. Should these have been discouraged as well? An exa… --- ## [LOINC Terminology Service updated for version 2.83](https://forum.loinc.org/t/loinc-terminology-service-updated-for-version-2-83/3136)
**Author:** [@system](https://forum.loinc.org/u/system)\ **Replies:** 0\ **Last updated:** [August 27, 2026, 2:51pm UTC](https://forum.loinc.org/t/loinc-terminology-service-updated-for-version-2-83/3136 "2026-08-27T14:51:22Z")
The LOINC Terminology Service using HL7® FHIR® has been updated to include content from the recently-released version 2.83. We apologize for any inconvenience this delay may have caused. This update includes numerous st… --- ## [Trouble with New LOINC Website](https://forum.loinc.org/t/trouble-with-new-loinc-website/3120)
**Author:** [@jencolrn](https://forum.loinc.org/u/jencolrn)\ **Replies:** 5\ **Last updated:** [August 6, 2026, 3:42pm UTC](https://forum.loinc.org/t/trouble-with-new-loinc-website/3120 "2026-08-06T15:42:38Z")
I seem to be in a loop. When I click the magnifier in the left menu to ‘Search Loinc,’ I am asked to confirm the Copyright. Once I hit Confirm, I’m taken right back to the homepage. Maybe I’m doing something incorrectl… --- ## [Representing Electronic Signatures in LOINC](https://forum.loinc.org/t/representing-electronic-signatures-in-loinc/3117)
**Author:** [@lmonico](https://forum.loinc.org/u/lmonico)\ **Replies:** 1\ **Last updated:** [July 30, 2026, 7:52pm UTC](https://forum.loinc.org/t/representing-electronic-signatures-in-loinc/3117 "2026-07-30T19:52:02Z")
In Canada, we’re looking for guidance on how LOINC recommends representing electronic signatures when a signature includes both the provider’s identity and the date/time the signature was applied. Many newer Laboratory … --- ## [PhenX LOINC codes](https://forum.loinc.org/t/phenx-loinc-codes/1943)
**Author:** [@KScott65](https://forum.loinc.org/u/KScott65)\ **Replies:** 4\ **Last updated:** [July 17, 2026, 6:09pm UTC](https://forum.loinc.org/t/phenx-loinc-codes/1943 "2026-07-17T18:09:29Z")
Hello, Is it acceptable to use PhenX codes? Or are the for PhenX only ? I need to find or request a code for Date of Diagnosis and was wondering if we can use 63931-0 ? --- ## [HbA1c LOINC 59261-8 (IFCC-RMP method but % units)](https://forum.loinc.org/t/hba1c-loinc-59261-8-ifcc-rmp-method-but-units/2990)
**Author:** [@ritamurteira](https://forum.loinc.org/u/ritamurteira)\ **Replies:** 1\ **Last updated:** [July 17, 2026, 5:34pm UTC](https://forum.loinc.org/t/hba1c-loinc-59261-8-ifcc-rmp-method-but-units/2990 "2026-07-17T17:34:46Z")
I have a question about the HbA1c LOINC code 59261-8 – “Hemoglobin A1c/Hemoglobin.total standardized per IFCC-RMP for CDT in Blood”. On the LOINC details page, I see: Component: Hemoglobin A1c/Hemoglobin.total^^stand… --- ## [Coronary Calcium Score](https://forum.loinc.org/t/coronary-calcium-score/3118)
**Author:** [@skassak](https://forum.loinc.org/u/skassak)\ **Replies:** 2\ **Last updated:** [July 17, 2026, 3:09pm UTC](https://forum.loinc.org/t/coronary-calcium-score/3118 "2026-07-17T15:09:19Z")
I have been in need of a LOINC code for the coronary calcium score. LOINC contains several concepts related to this but they appear to represent the performance of the CT that is used to obtain the images but not the sc… --- ## [Website system maintenance 2026-07-19](https://forum.loinc.org/t/website-system-maintenance-2026-07-19/3116)
**Author:** [@timbriscoe](https://forum.loinc.org/u/timbriscoe)\ **Replies:** 0\ **Last updated:** [July 13, 2026, 2:07pm UTC](https://forum.loinc.org/t/website-system-maintenance-2026-07-19/3116 "2026-07-13T14:07:45Z")
We will be performing maintenance on the loinc.org website on Sunday, July 19, 2026 (2026-07-19) starting at 1:00 p.m. EDT (17:00 UTC). This window is scheduled for four hours, ending at approximately 5:00 p.m. EDT (21:0… --- ## [Unable to access RELMA](https://forum.loinc.org/t/unable-to-access-relma/3106)
**Author:** [@sameerabbas248](https://forum.loinc.org/u/sameerabbas248)\ **Replies:** 3\ **Last updated:** [July 6, 2026, 12:55pm UTC](https://forum.loinc.org/t/unable-to-access-relma/3106 "2026-07-06T12:55:05Z")
I have looked all over the internet for a solution to this. I get the following error every time I open RELMA - Sorry but an error has occurred. You may report the problem at https://loinc.org/contact-loinc/relma. I ha… --- ## [4476-8 Complement Cl esterase inhibitor.functional \[Mass/volume\] in Serum or Plasma may be incorrect](https://forum.loinc.org/t/4476-8-complement-cl-esterase-inhibitor-functional-mass-volume-in-serum-or-plasma-may-be-incorrect/2622)
**Author:** [@bgoldberg](https://forum.loinc.org/u/bgoldberg)\ **Replies:** 8\ **Last updated:** [July 3, 2026, 10:24pm UTC](https://forum.loinc.org/t/4476-8-complement-cl-esterase-inhibitor-functional-mass-volume-in-serum-or-plasma-may-be-incorrect/2622 "2026-07-03T22:24:19Z")
Functional assays for C1 inhibitor (chromogenic or EIA) are expressed as the percentage of the mean level in normal specimens rather than as a mass concentration. The mass concentration of C1 inhibitor in a subject with … --- ## [When and where to use similar LIONC codes](https://forum.loinc.org/t/when-and-where-to-use-similar-lionc-codes/3108)
**Author:** [@jmarino3](https://forum.loinc.org/u/jmarino3)\ **Replies:** 2\ **Last updated:** [July 1, 2026, 9:07pm UTC](https://forum.loinc.org/t/when-and-where-to-use-similar-lionc-codes/3108 "2026-07-01T21:07:22Z")
Hello, I am wondering if anyone could help me understand the difference and use cases for these 3 very similar LIONC codes. I am not sure where to look to find the answers. Thank you for the assistance. --- ## [Umbilical Cord Tissue Drug testing](https://forum.loinc.org/t/umbilical-cord-tissue-drug-testing/3107)
**Author:** [@KScott65](https://forum.loinc.org/u/KScott65)\ **Replies:** 1\ **Last updated:** [June 29, 2026, 6:32pm UTC](https://forum.loinc.org/t/umbilical-cord-tissue-drug-testing/3107 "2026-06-29T18:32:25Z")
Hi. We have qualitative drug monitoring testing on umbilical cord tissue. Mass Spec. Not seeing any LOINCs for these other than Screen methods. We are not confirming. Would the Screen LOINCs be appropriate to assign or w… --- ## [LOINC Answer List LL5355-4](https://forum.loinc.org/t/loinc-answer-list-ll5355-4/2667)
**Author:** [@bobgag](https://forum.loinc.org/u/bobgag)\ **Replies:** 1\ **Last updated:** [June 29, 2026, 2:55pm UTC](https://forum.loinc.org/t/loinc-answer-list-ll5355-4/2667 "2026-06-29T14:55:13Z")
LOINC answer code LA14072-5 Unsure is contained in several LOINC answer lists including LOINC Answer list LL5355-4 PRAPARE\_Y|N|Unsure|No Partner|Not Answer. While I am able to access LOINC Answer List LL5355-4 via a li… --- ## [LOINC Questionnaire definition](https://forum.loinc.org/t/loinc-questionnaire-definition/2484)
**Author:** [@nhphong](https://forum.loinc.org/u/nhphong)\ **Replies:** 10\ **Last updated:** [June 29, 2026, 1:29pm UTC](https://forum.loinc.org/t/loinc-questionnaire-definition/2484 "2026-06-29T13:29:36Z")
Hi Community, Recently, I saw Questionnaire definition came long with LOINC Code, so I wonder if those definitions are available in the Release files or not (I am checking the file content right now, but still want to a… --- ## [Identification of Questionnaire codes](https://forum.loinc.org/t/identification-of-questionnaire-codes/2633)
**Author:** [@achattopadhyay](https://forum.loinc.org/u/achattopadhyay)\ **Replies:** 5\ **Last updated:** [June 23, 2026, 8:46pm UTC](https://forum.loinc.org/t/identification-of-questionnaire-codes/2633 "2026-06-23T20:46:07Z")
How to identify Physical Health Questionnaire codes from the entire set of LOINC? --- ## [LOINC Comparisons](https://forum.loinc.org/t/loinc-comparisons/3049)
**Author:** [@adoming1](https://forum.loinc.org/u/adoming1)\ **Replies:** 2\ **Last updated:** [June 23, 2026, 7:21pm UTC](https://forum.loinc.org/t/loinc-comparisons/3049 "2026-06-23T19:21:31Z")
Hello. I’m a new LOINC user and was wondering if someone could explain the difference between LOINCs 13524-4 and 75353-3. I’m trying to decide which one to use for a new result component I’ve built, but from what I can… --- ## [Pre-submission guidance on cfDNA fetal-antigen and carrier-result modeling](https://forum.loinc.org/t/pre-submission-guidance-on-cfdna-fetal-antigen-and-carrier-result-modeling/3086)
**Author:** [@bcolemanbto](https://forum.loinc.org/u/bcolemanbto)\ **Replies:** 8\ **Last updated:** [June 22, 2026, 7:17pm UTC](https://forum.loinc.org/t/pre-submission-guidance-on-cfdna-fetal-antigen-and-carrier-result-modeling/3086 "2026-06-22T19:17:18Z")
Hi LOINC team, I’m preparing a coordinated LOINC submission for structured results from our carrier screening, cfDNA NIPT, and fetal antigen testing, and would appreciate brief pre-submission guidance on a few modeling … --- ## [Class of antibiotics](https://forum.loinc.org/t/class-of-antibiotics/3087)
**Author:** [@mtchiaravalloti](https://forum.loinc.org/u/mtchiaravalloti)\ **Replies:** 4\ **Last updated:** [June 18, 2026, 3:52pm UTC](https://forum.loinc.org/t/class-of-antibiotics/3087 "2026-06-18T15:52:13Z")
Hello! My question is about how to deal with mapping of classes of antibiotics. In a local catalogue they have test codes for Amdinopenicillins, Aminocyclitols, and so on. Best, Maria --- ## [Need help to map placement of NEPHROURETEROSTOMY RF](https://forum.loinc.org/t/need-help-to-map-placement-of-nephroureterostomy-rf/3088)
**Author:** [@salve58](https://forum.loinc.org/u/salve58)\ **Replies:** 3\ **Last updated:** [June 17, 2026, 12:58pm UTC](https://forum.loinc.org/t/need-help-to-map-placement-of-nephroureterostomy-rf/3088 "2026-06-17T12:58:08Z")
We are looking for a LOINC code to map for placement of NEPHROURETEROSTOMY via RF. I do not see any available code for this. But while looking for possible LOINC code it appears that the ‘System’ is the same for NEPHROUR… --- ## [Help identifying the best LOINC code for CDA Specimen Collection Template](https://forum.loinc.org/t/help-identifying-the-best-loinc-code-for-cda-specimen-collection-template/3084)
**Author:** [@rmerrick](https://forum.loinc.org/u/rmerrick)\ **Replies:** 0\ **Last updated:** [June 15, 2026, 10:24pm UTC](https://forum.loinc.org/t/help-identifying-the-best-loinc-code-for-cda-specimen-collection-template/3084 "2026-06-15T22:24:02Z")
It seems that in IHE’s XD-Lab we have been using an incorrect LOINC to represent the Specimen Collection section in the CDA: here is the definition from XD-Lab: https://loinc.org/33882-2/ = Collection date of Sp… --- ## [RDW-CV to RDW-SD Mapping - Why?](https://forum.loinc.org/t/rdw-cv-to-rdw-sd-mapping-why/2905)
**Author:** [@mwilsonhunting](https://forum.loinc.org/u/mwilsonhunting)\ **Replies:** 1\ **Last updated:** [June 15, 2026, 8:02pm UTC](https://forum.loinc.org/t/rdw-cv-to-rdw-sd-mapping-why/2905 "2026-06-15T20:02:50Z")
I’m looking for more guidance on the mapping between RDW-CV and RDW-SD. The standard code description for 21000-5 RDW-SD (fL) and 788-0 RDW-CV (%). Per LONIC search, 21000-5 is deprecated and maps to 788-0, however, thei… --- ## [LOINC Offline Browser with MCP and Agent Skill](https://forum.loinc.org/t/loinc-offline-browser-with-mcp-and-agent-skill/3083)
**Author:** [@vgcf](https://forum.loinc.org/u/vgcf)\ **Replies:** 1\ **Last updated:** [June 15, 2026, 7:52pm UTC](https://forum.loinc.org/t/loinc-offline-browser-with-mcp-and-agent-skill/3083 "2026-06-15T19:52:33Z")
Dear All I have made a simple go based tool and Svelte based frontend to browse LOINC codes locally. The entire process of using is as simple as downloading the binary from GitHub, placing the release 2.82 zip file in … [Next page](https://forum.loinc.org/latest.md?page=1)