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Category: Coagulation Factors

Confusing Coag Test Names

On October 16, 2013 George spoke on the subject, “Clumsy Coagulation Communication, Let’s Blame the Lab” in Seattle, Washington. One issue we discussed was confusing coagulation test names, and we talked about the kinds of erroneous orders that are generated. Here is a follow-up to the presentation, a brief list of confusing names with an explanation for each. This list may be incomplete, please comment with some test ordering and naming problems you have seen. Geo.

Confusing Coagulation Test Names

“Backwards” FVIII Dilutions

From Kim Kinney, Indiana University Health,  Hi George! We have a severe hemophiliac with an 8BU inhibitor receiving ReFacto. Factor assays are high, but dilutions dilute backward! 367, 238, then 183, then 167 causing a CV flag. We have seen this before, but have never heard an explanation for the “backward” dilution affect. Can you shed light? It does not happen on all treated hemophiliacs…is it the ReFacto? Thanks for the info!

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Prolonged PT, TT, and PTT

From Ning Tang: Hi, George, I come from a clinical laboratory in China. We met a confusing case today and want to get your suggestion: A patient had a prolonged prothrombin time (PT, 20s), partial thromboplastin time (APTT, PTT, 52s) and thrombin time (TT, 127s). Fibrinogen activity is within reference interval (by both Clauss method and TEG), also the patient shows slight bleeding symptoms, is this dysfibrinogenemia? How to confirm it? Thanks for your help!

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Antibodies to Bovine Thrombin

From Manju Bala, St Christopher’s Hospital for Children. Need help with interpreting a coagulation dilemma. A child, 4 months old, post cardiac surgery, no meds, use of bovine thrombin during surgery with prolonged prothrombin time (PT), 29.9s; partial thromboplastin time (PTT, APTT),107.7s; and thrombin time (TT), 40.4s; no correction on mixing. FII, 25%; FV, 7%, increasing with dilution; FVIII, 129%; FIX, 39%; FX, 69% and FXI, 50%. The latter four factors, although normal appear to increase on dilution like an inhibitor. No evidence of bleeding, no evidence of thrombosis, liver function tests normal. Could this be due to an antibody to bovine thrombin or lupus anticoagulant? Testing is pending.

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Ferritin and Prolonged PT/PTT?

From Natalie Shorey, Stago, Inc. Regional Manager, Sydney, Australia:

This clinical case & related question came from the scientists at St George Hospital, one of our teaching hospitals here in Sydney. It prompted some discussion when I put it to other scientists, withour coming to any conclusion so I thought I’d pose the question to you.

A patient has multi organ failure with a grossly elevated ferritin of >99999 ug/mL and the following coagulation profile: prothrombin time (PT), 26.9 s; PT mix, 16.9 s; partial thromboplastin time (APTT) 125 s; APTT mix, 43.8 s ( partial correction), fibrinogen 1.9 g/L; thrombin time (TCT) 87.9 s; D-dimer <20 ng/ml, equivocal lupus, reduced extrinsic and intrinsic factors. Heparin has been excluded as a cause of the elevated APTT. Can the extremely high ferritin level be the cause or someway be attributed to the prolonged APTT?

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Prolonged PTT in FXII Deficiency

From Maria Grana, Baptist Health Center:

Hello, we recently had a patient with very high partial thromboplastin time (aPTT, PTT) resu;ts, anywhere from 115 to >200 seconds. The mixing study indicated a factor deficiency. Factor assays performed (IX, XI) were within normal limits, FVIII was elevated (>200) and Factor XII was 48%. It did not appear that FXII was low enough to warrant such a high aPTT. Is this a true statement? How low does the factor XII have to be to produce such a high aPTT? Thanks!

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Assaying for HMWK and PK

From Michele L. Drejka, Lead Technologist, Barnabas Health, Newark, NJ:

Hi George, Sorry to be redundant, but I posted this in ‘Comments,’ however I actually need an answer to my question below, so I am repeating here: Regarding prolonged activation times-I’m getting frustrated. I had more success with playing with this 15 years ago! However, this is what our lab does for prekallikrein (PK, Fletcher) and high molecular weight kininogen (HMWK, HK, Fitzgerald) deficiencies. First we do a silica-based partial thromboplastin time (PTT) mixing study with incubation. When it corrects without prolonging and all other factors are normal we go to a specific PTT mix using known PK-deficient and then HMWK-deficient plasma. When we find correction with one and non-correction (bingo!) with the other mix then we know which deficiency we have. Do you see any flaws in this rational? P.S. We do not quantify these two factors because of maintenance on assays that would be rarely used.

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From Jasmina Ahluwalia:  Hi George, Is there any advantage of choosing an immunotubidimetric (latex immunoagglutination, LIA) assay over the enzyme-linked immunosorbent assay (ELISA) for von Willebrand factor antigen (VWF:Ag)?

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