A radioconjugate composed of the iminodiacetic acid derivative mebrofenin bound to an isotope of the synthetic element technetium (Tc). Upon administration and rapid clearance form the circulation, technetium Tc 99m mebrofenin is secreted into the hepatobiliary system, emitting gamma rays that are detectable with planar scintigraphy or single photon emission computer tomography (SPECT). Mebrofenin has no pharmacological effect at the recommended dosage for diagnostic imagining.