Alpplaccfrserpl
A blood test that measures the ratio of placental alkaline phosphatase to total alkaline phosphatase, used to assess placental function during pregnancy.
{"This test measures placental alkaline phosphatase (PLAP) levels relative to total ALP","It helps evaluate how well the placenta is functioning during pregnancy","Blood sample is collected from a vein in your arm","Results are reported as a ratio or percentage","Abnormal results may require further testing"}
Key facts at a glance
- LOINC
- 15016-9
- Short code
- ALP Plac CFr SerPl
- Synonyms
- ALP Plac CFr SerPl
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- not specified
- Ref low
- 0
- Ref high
- 0.05
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 84075
- SNOMED
- 27550007
- 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 is this test?
The placental alkaline phosphatase ratio test measures the amount of placental alkaline phosphatase (PLAP) compared to the total amount of alkaline phosphatase (ALP) in your blood. Alkaline phosphatase is an enzyme found in various tissues including the liver, bones, intestines, and placenta. During pregnancy, the placenta produces a specific type of alkaline phosphatase called placental alkaline phosphatase (PLAP).
Why is this test performed?
This test is primarily used to evaluate placental function during pregnancy. The placenta is essential for providing nutrients and oxygen to your growing baby. By measuring the ratio of placental ALP to total ALP, healthcare providers can get insight into how well the placenta is working and whether there are any concerns with placental function.
How is the test performed?
A healthcare professional will draw a small blood sample from a vein in your arm using a needle. The blood is collected into a tube and sent to a laboratory for analysis. The procedure only takes a few minutes and is generally well-tolerated. You may experience minor bruising or soreness at the puncture site, which typically resolves quickly.
What do the results mean?
Results are typically reported as a ratio (PLAP/total ALP) or as a percentage. Your healthcare provider will interpret these results based on your specific situation, including how far along you are in your pregnancy. Normal values may vary by laboratory, so it is important to discuss your specific results with your healthcare provider.
Reference range
0.00-0.05not specified
No special preparation or fasting required
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Do I need to fast before this test?
Is this test safe during pregnancy?
What can affect my test results?
Will I need additional tests if my results are abnormal?
How long does it take to get results?
Sources
- 1
- 2
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.
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 16, 2026. · Read our editorial policy