Automated total body albumin analyzer

• US 9,002,656 B2
• Filed: 10/17/2011
• Issued: 04/07/2015
• Est. Priority Date: 10/17/2011
• Status: Active Grant

• Current Assignee: Daxor Corp.
• Original Assignee: Daxor Corp.
• Inventors: Feldschuh, Jonathan, Feldschuh, Joseph
• Primary Examiner(s): BORIN, MICHAEL L
• Application Number:
  US13/275,041
• Publication Number:
  US 20130096836A1
• Time in Patent Office: 1,268 Days
• US Class Current: 702/19
• CPC Class Codes: A61B 5/02755 Radioactive tracers
• CPC Class Codes: A61B 5/1427 Multiple blood sampling, e.g. at periodic or pre-established intervals
• CPC Class Codes: A61B 5/14546 for measuring analytes not otherwise provided for, e.g. ions, cytochromes
• CPC Class Codes: A61B 5/15003 for venous or arterial blood
• CPC Class Codes: A61B 5/155 Devices specially adapted for continuous or multiple sampling, e.g. at predetermined intervals devices loaded with multiple lancets simultaneously A61B5/15146
• CPC Class Codes: A61B 5/157 Devices characterised by integrated means for measuring characteristics of blood
• CPC Class Codes: G01N 2333/76 Assays involving albumins other than in routine use for blocking surfaces or for anchoring haptens during immunisation
• CPC Class Codes: G01N 33/6827 Total protein determination, e.g. albumin in urine
• CPC Class Codes: G16B 25/10 Gene or protein expression profiling; Expression-ratio estimation or normalisation
• CPC Class Codes: G16B 99/00 Subject matter not provided for in other groups of this subclass

Abstract

A computer-based method for automatically determining total body albumin of a living being based on the calculated intravascular albumin, the calculated observed ratio of amount of albumin in the intravascular system to amount of albumin in the extravascular system at the first time, and the baseline of expected ratio of amount of albumin in the intravascular system to amount of albumin in the extravascular system at the first time.

Claims

1. An automated total body albumin analyzer comprising a processor and a non-transitory computer-readable medium including instructions that are read by the processor to perform the following method:

injecting radio-labeled albumin into the bloodstream of a human subject;

collecting blood samples from the human subject over a time period after injection;

gathering data related to a number of counts of radio-labeled albumin within each sample;

receiving input of a baseline of expected ratio of amount of albumin in an intravascular system of the human subject to amount of albumin in an extravascular system of the human subject, wherein the baseline is a baseline curve based on a locally weighted scatterplot smoothing analysis of ratios of count values of radio-labeled albumin over a period of time after the radio-labeled albumin is initially injected into a control group of human subjects to count values of radio-labeled albumin at a time when the radio-labeled albumin is initially injected into the control group of human subjects;

receiving input of albumin concentration of the human subject;

calculating plasma volume of the human subject based on detected counts of radio-labeled albumin injected into the human subject;

calculating an amount of intravascular albumin within the human subject based on the calculated plasma volume and the albumin concentration of the human subject;

calculating an observed ratio of amount of albumin in the intravascular system of the human subject to amount of albumin in the extravascular system of the human subject at at least one time after injecting the radio-labeled albumin into the human subject; and

calculating the total body albumin of the human subject based on the calculated intravascular albumin, the calculated observed ratio of amount of albumin in the intravascular system to amount of albumin in the extravascular system at the at least one time, and the baseline of expected ratio of amount of albumin in the intravascular system of the human subject to amount of albumin in the extravascular system of the human subject at the at least one time, wherein the calculated observed ratio is known to exhibit a consistent deviation from the baseline, and wherein the step of calculating the total body albumin is performed before rate of loss of albumin in the intravascular system of the human subject to the extravascular system of the human subject is stabilized.

2. The automated total body albumin analyzer of claim 1, wherein the at least one time comprises multiple times, and the method further comprises calculating an average value of the total body albumin calculated at the multiple times.

3. The automated total body albumin analyzer of claim 1, wherein the step of calculating plasma volume is performed using an automated blood volume analyzer.