Factor 2 (Prothrombin) by PCR

Abbrev Code:F2MD   
Order Code:LAB4906Order Name:F2 Prothrombin 20210A Mut Anal
Synonyms:Factor 2 Mutation; F2PCR; Prothrombin 20210A Genetic Mutation; Molecular; Factor 2 Gene Interpretation, F2MA; F2MAR
Methodology:Amplification of DNA with restriction digest, detection by gel electrophoresis.
CPT Codes: 81240 x1, G0452 x1
Turnaround Time:Results are reported within 5 days.
Special Instructions:A signed informed consent in the patient's medical record is required; the consent should not be sent to the laboratory. The link to the Genetic Testing Consent Form is provided as a convenience for the providers and genetic counselors. Bone Marrow Transplant Patients; If a patient is the recipient of an allogeneic transplant, this test must be done on a pre-transplant sample. Contact the Molecular Diagnostics lab to see if a pre-transplant sample is available.
Associated Links:

Genetic Testing Consent Form

Collection Instructions

Optimal Volume:10 mL
Minimum\Peds Volume:2 mL
Container:Yellow (ACD, Solution A) tube available from laboratory
Alternate Containers: Orocollect Dx Buccal Swabs, Purple (EDTA), Yellow (ACD, Solution B) tube available from laboratory
Causes for Rejection:Frozen specimen; incorrect tube, clotted specimen, specimen more than 5 days old. Patients are only tested ONCE; if duplicate sample is collected, testing is canceled, credited and original results and collection date reported. Contact 612-273-8445 with questions. Testing requested on a sample punctured by an automated instrument. Add on testing to hematology samples is not accepted.  DNA extracted at non-CLIA certified (or equivalent) lab.

Processing and Shipping

Specimen Processing:Do not process whole blood. Store at room temperature.
Shipping Instructions:Ship at room temperature.
Test Performed at or Referral Lab UM Molecular Diagnostics (M)  (UMMC East Bank)


Reference Range:Results are reported as "present" or "absent" for the mutation. Heterozygosity or Homozygosity is also determined. See interpretive report.

A cause of inherited thrombophilia is a single point mutation in the prothrombin (Factor 2) gene. The prothrombin mutation has a prevalence of 1-2% in the general population and is thought to increase the risk of venous thrombosis by elevating the level of prothrombin in the blood. Preliminary studies indicate that the increased risk of venous thrombosis for patients with the prothrombin mutation is approximately 3-fold. Molecular based testing is the only accurate method for detecting the prothrombin mutation. The molecular test can be performed on both untreated and anticoagulated (heparin or warfarin) patients. Patients who previously tested negative for the Factor 5 Leiden mutation can have prothrombin gene mutation analysis performed using the original sample which has been stored by the Molecular Diagnostics Laboratory.


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