(a) In determining whether a claimant developed chronic renal disease following pertinent employment as an ore transporter, the Assistant Director shall resolve all reasonable doubt in favor of the claimant. A conclusion that a claimant developed chronic renal disease must be supported by medical documentation.

(b) A claimant or beneficiary may submit any of the following forms of medical documentation in support of a claim that the claimant contracted chronic renal disease.

(1) Pathology report of tissue biopsy;

(2) If laboratory or radiographic tests exist:

(i) Abnormal plasma creatinine values;

(ii) Abnormal glomerular filtration rate (by either measured creatinine or iothalamate clearance or calculated by MDRD equation); and

(iii) Renal tubular dysfunction as evidenced by:

(A) Glycosuria in the absence of diabetes mellitus;

(B) Proteinuria less than one gram daily without other known etiology; or

(C) Hyperphosphaturia, aminoaciduria, B-2 microglobinuria or alkaline phosphaturia or other marker of proximal tubular injury; or

(iv) Radiographic evidence of chronic renal disease;

(3) Autopsy report;

(4) Physician summary report;

(5) Hospital discharge summary report;

(6) Hospital admitting report; or

(7) Death certificate, provided that it is signed by a physician at the time of death.