What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCObservation

LOINC Code 48640-7: Second trimester triple maternal screen Nar [Interp]

Name: LOINC Code 48640-7: Second trimester triple maternal screen Nar [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:33.168Z

48640-7 is a LOINC code used to identify Second trimester triple maternal screen Nar [Interp] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Second trimester triple maternal screen. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Second trimester triple maternal screen. It is commonly used with the system or sample type Ser/Plas.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: DEPRECATED
Order vs observation: Observation

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Deprecated Second trimester triple maternal screen [interpretation] in Serum Narrative
Second trimester triple maternal screen
2nd; 2nd trimester 3 screen; AFP X-tra; Alpha-1-fetoprotein & Choriogonadotropin & Estriol.unconjugated; Chemistry; Gestation; Gyn; Gynecology; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Maternal screen 3; Narrative; OB; ObGyn; Obstetrics; Pl; Plasma; Plsm; Point in time; Prenatal; Random; Report; Scn; Scr; Scrn; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Tri; Trip; Triple marker screen

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Second trimester triple maternal screen Nar [Interp]Deprecated Second trimester triple maternal screen [interpretation] in Serum NarrativeDeprecated 2nd trimester 3 screen Ser-ImSecond trimester triple maternal screenCHEMInterpretation of Second trimester triple maternal screen test result, BloodImp

Frequently asked questions

Code details

Code48640-7

SystemLOINC

Display nameSecond trimester triple maternal screen Nar [Interp]

DescriptionSecond trimester triple maternal screen

Short nameDeprecated 2nd trimester 3 screen Ser-Im

ComponentSecond trimester triple maternal screen

PropertyImp

TimingPt

System (specimen)Ser/Plas

ScaleNar

ClassCHEM

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.21

Last changed2.36

Consumer names

Interpretation of Second trimester triple maternal screen test result, Blood

Part names

Second trimester triple maternal screenImpPtSer/PlasNarImpression/interpretation of studyPoint in time (spot)Serum or Plasma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.