Plasma thromboplastin antecedent (PTA, factor XI): a specific and sensitive radioimmunoassay. [/sup 125/I tracer technique]

Journal Article · Thu Sep 01 00:00:00 EDT 1977 · Blood; (United States)

OSTI ID:7285231

Saito, H; Goldsmith, Jr, G H

A specific, sensitive, and reproducible radioimmunoassay for human plasma thromboplastin antecedent (PTA, factor XI) has been developed with purified PTA and monospecific rabbit antiserum. Precise measurements of PTA antigen were possible for concentrations as low as 0.3% of that in normal pooled plasma. Normal plasma contained approximately 6 ..mu..g PTA/ml. A good correlation (correlation coefficient 0.68) existed between the PTA procoagulant assays and radioimmunoassays among 50 normal adults (25 males and 25 females). PTA antigen was markedly reduced in plasma of 13 patients with congenital homozygous PTA deficiency (range <0.003-0.128 U/ml) and 9 patients with hepatic cirrhosis (0.35 +- 0.17 U/ml), but was normal in those of 9 patients under treatment with warfarin, 8 patients with disseminated intravascular coagulation and 16 patients with other congenital clotting factor abnormalities, including prekallikrein deficiency (Fletcher trait) and high molecular weight kininogen deficiency (Fitzgerald trait).

• Research Organization: Case Western Reserve Univ., Cleveland
• OSTI ID: 7285231
• Journal Information: Blood; (United States), Vol. 50:3
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
THROMBOPLASTIN
RADIOIMMUNOASSAY
ANTIGENS
BLOOD PLASMA
IODINE 125
PATIENTS
TRACER TECHNIQUES
BETA DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BLOOD
BLOOD COAGULATION FACTORS
BODY FLUIDS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
RADIOASSAY
RADIOISOTOPES
550601* - Medicine- Unsealed Radionuclides in Diagnostics