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Phenotypic assessment of pregnancy end date (qualitative screening)

Published: August 9, 2026Updated: August 17, 2026

This test evaluates certain biochemical markers in a blood sample to help determine if pregnancy has ended naturally (abortion) or if it is still viable. It is not a standard diagnostic test but may be used in specialized clinical contexts to assess pregnancy status.

Quick summary

["This screening helps identify potential biochemical signs of pregnancy termination."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
64712-3
Short code
Pregnancy end date PhenX
Synonyms
Pregnancy end date PhenX
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Critical range
0.5 N/A – —
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
phenx
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

The test detects specific protein or hormone-related changes in the blood that could indicate the biological process of pregnancy ending. These markers are analyzed qualitatively (qualitative screening) rather than quantitatively, meaning the result is a yes/no or positive/negative assessment rather than a precise measurement.

Why It Might Be Ordered

This test is typically used in research, specialized fertility studies, or advanced diagnostic settings where determining pregnancy viability or biochemical markers of miscarriage is critical. It is not routinely performed in standard clinical practice for general patient care.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The sample is processed to separate serum or plasma, which is then analyzed for the relevant biochemical markers. This process is standard for most blood tests.

What to Expect Before the Test

No special preparation is needed for this test. You may continue with your normal activities, but avoid heavy exercise or consuming alcohol before the blood draw, as these can sometimes affect test results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Pregnancy End Date Phenotype Screen

Frequently asked questions

What does a positive result mean?
A positive result suggests the presence of biochemical markers consistent with pregnancy ending naturally. However, this does not confirm a miscarriage or ectopic pregnancy. Further evaluation by your healthcare provider is necessary to determine the cause and next steps.
Can this test replace an ultrasound?
No, this test is not a substitute for ultrasound imaging. Ultrasound remains the gold standard for visualizing pregnancy and assessing fetal viability. This test provides additional biochemical information but is not a diagnostic imaging tool.
How often can this test be repeated?
This test is generally not repeated routinely unless part of a specific research protocol or advanced clinical study. Repeated testing may be considered under specialized circumstances, such as monitoring for recurrent pregnancy loss, but should be discussed with your healthcare provider.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy