Complete Blood Count (CBC) Test
This test checks whether a mother has received benzathine penicillin treatment, an antibiotic used to treat syphilis and prevent passing it to the baby.
Benzathine penicillin is an antibiotic injection used to treat syphilis in pregnant women The test confirms if the mother received proper treatment before delivery Proper treatment helps prevent congenital syphilis in newborns The test is performed on a blood sample (serum) Treatment is typically given as injections at least 3 months before delivery for best results
Key facts at a glance
- LOINC
- 75184-2
- Short code
- AMOUNTOFBENZATHINEPENICILLINTREATMENT
- Synonyms
- —
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- cdc-cs
- 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
A complete blood count, also called a CBC, is a common blood test that measures the different cells in your blood, including red blood cells, white blood cells, and platelets. It gives your doctor a broad picture of your overall health and helps check for many different conditions.
The Benzathine Penicillin Treatment test checks if a pregnant mother has received benzathine penicillin, an antibiotic commonly used to treat syphilis. Syphilis is a sexually transmitted infection that can be passed from a mother to her unborn baby during pregnancy. When a pregnant woman tests positive for syphilis, she needs to be treated with benzathine penicillin injections to protect her baby from developing congenital syphilis, which can cause serious health problems.
For this test, a small sample of blood is drawn, usually from a vein in your arm. A healthcare professional will clean the site, wrap a band around your upper arm, and use a thin needle to collect the sample. The procedure takes only a few minutes, and you can usually return to your normal activities right away.
A healthcare provider will draw a small blood sample from your arm. This blood is then sent to a laboratory where it is tested to detect the presence of benzathine penicillin or its effects. The test is part of standard prenatal care when syphilis screening shows a positive result.
This test is important because it can help detect a wide range of conditions, such as anemia, infections, and blood disorders, often before you notice any symptoms. It also helps your doctor monitor ongoing health problems and see how well a treatment is working over time.
If a pregnant woman has syphilis and does not receive proper treatment, the infection can cross the placenta and infect the unborn baby. This can lead to stillbirth, premature birth, low birth weight, or serious birth defects. Treating the mother with benzathine penicillin can effectively prevent these complications. This test helps healthcare providers confirm that adequate treatment has been given.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is primarily used in prenatal care to verify treatment of syphilis in pregnant women. A positive result indicates the mother has received benzathine penicillin treatment, which significantly reduces the risk of congenital syphilis in the infant. The CDC recommends that all pregnant women be screened for syphilis early in pregnancy, with repeat testing for those at higher risk. Proper documentation of treatment is essential for preventing congenital syphilis and ensuring appropriate neonatal care.
In cases where the test shows treatment was not given or was inadequate, healthcare providers can arrange for immediate treatment. The timing of treatment is important—at least 3 months before delivery is ideal for preventing infection in the baby. This test is part of the public health effort to eliminate congenital syphilis.
Frequently asked questions
Does this test hurt?
How long does it take to get results?
What happens if I test positive for syphilis during pregnancy?
Can I breastfeed if I was treated for syphilis?
Will my baby need testing after birth?
Sources
- 1
- 2
- 3
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