Hemoglobin F, Red Cell Distribution, Blood
Testing Algorithm Delineates situation(s) when tests are added to the initial order. This includes reflex and additional tests.
The percent of the patient's hemoglobin F is very important to the clinical utility of this test. HBF / Hemoglobin F, Blood will be performed at an additional charge to determine if Hemoglobin F, Red Cell Distribution testing is warranted. If the hemoglobin F value is normal for age or if the value is less than 5%, the red cell distribution test will not be performed. Samples with hemoglobin F (Hb F) levels above 35% will be accepted but are discouraged due to decreased test specificity. For these markedly elevated Hb F levels, a hemoglobin electrophoresis profile with request for beta globin gene molecular testing for elevated Hb F levels is recommended.
For information on thalassemias and appropriate test ordering, see Thalassemia/Hemoglobinopathy Patient Information in Special Instructions.
Specimen Type Describes the specimen type needed for testing
Whole Blood EDTA
This test is a flow cytometry assay that determines the distribution of hemoglobin F (Hb F) within red blood cells. The HGBCE / Hemoglobin Variant, A2 and F Quantitation, Blood test is intended for monitoring purposes, such as the increase in Hb F after therapy, or the levels of hemoglobin variants after transfusion.
This test should not be ordered for fetal-maternal bleed. If fetal maternal bleed assessment is desired, see FMB / Fetomaternal Bleed, Flow Cytometry, Blood.
1. Indicate the percent of hemoglobin F detected by hemoglobin electrophoresis. If this is not indicated, we will perform HBF / Hemoglobin F, Blood.
2. Indicate the reason for testing.
Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.
Container/Tube: Lavender top (EDTA)
Specimen Volume: 3 mL
If not ordering electronically, complete, print, and send a Benign Hematology Test Request Form (T755) with the specimen (http://www.mayomedicallaboratories.com/it-mmfiles/benign-hematology-test-request-form.pdf)
Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.
Mild reject; Gross reject
Mild OK; Gross OK
Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.
|Whole Blood EDTA||Refrigerated||7 days|