Platelets
Low (or dropping) in 98% of<unk>  patients
Sn, not Sp
Repeat platelets may be necessary if first level normal or if need to trend
PT and PTT
Prolonged
May be normal in as many as 50% of<unk>  patients
Serial coagulation testing may be necessary
PT, not INR, is used for monitoring
Fibrinogen
Low
<100 correlates with severe<unk> 
May be normal (acute phase reactant), up to 57% in <unk>  patients
FDP
Elevated
D-dimer
Elevated
Sn but not Sp: may also see in patients with chronic liver or renal disease
Combination of elevated FDP and d-dimer may increase sensitivity and specificity
RBCs
Fragmented (not specific)
Low (or dropping) in 98% of<unk>  patients
Sn, not Sp
Repeat platelets may be necessary if first level normal or if need to trend
Prolonged
May be normal in as many as 50% of<unk>  patients
Serial coagulation testing may be necessary
PT, not INR, is used for monitoring
Low
<100 correlates with severe<unk> 
May be normal (acute phase reactant), up to 57% in <unk>  patients
Elevated
Elevated
Sn but not Sp: may also see in patients with chronic liver or renal disease
Combination of elevated FDP and d-dimer may increase sensitivity and specificity
Fragmented (not specific)
FDP: Elevated
D-dimer: Elevated
Platelet: Variable
Fibrinogen: Normal-elevated
PT: Normal
PTT: Normal
RBCs
Fragmented
Fragmented
Disseminated intravascular coagulation
Disseminated Intravascular Coagulation 
Heparin-Induced Thrombocytopenia 
Thrombotic Thrombocytopenic Purpura 
Immune thrombocytopenic purpura
Hemolytic Uremic Syndrome 
Thrombotic thrombocytopenic purpura
HELLP syndrome