Table 6. Various TDM methods and estimated commercial cost of equipment.

Method of TDM (N = 50 studies)	Total N= 53 (%)	Estimated Cost of Equipment
Auto-analyzer	3 (5.6)	$14,000
Chemiluminescent Immunoassay	2 (3.7)	Unknown
Enzyme Multiplied Immunoassay Technique	3 (5.6)	$1600 (Cobas), $11,500 (Syva)
Fluorescence Polarization Immunoassay	22 (41.5)	$1000 (TDx)
Gas Chromatography	2 (3.7)	$79,500
High Performance Liquid Chromatography (HPLC)	9 (16.9)	$21,500
HPLC with fluorescence detection	1 (1.8)	$1799.99
HPLC with Ultraviolet detection (HPLC-UV)	5 (9.4)	$2,695
Liquid Chromatography-Mass Spectrometry LC-MS	3 (5.6)	$149,000
Reversed phase HPLC with UV detection	1 (1.8)	$1100
Thin Layer Chromatography (TLC)	1 (1.8)	Unknown
TLC with fluorescence detection	1 (1.8)	Unknown