Ureter Identification With IRDye 800BK

Inclusion Criteria (Group A \& B participants) * Participant is willing and able to give informed consent for participation in the trial. * Male or Female, aged 18 years or above. * Undergoing elective laparoscopic abdominal surgery or undergoing planned laparoscopic donor nephrectomy (donation) * Participant has available laboratory and ECG results within 3 months of enrolment. * Female participants of child bearing potential and male participants whose partner is of child bearing potential must be willing to ensure that they or their partner use effective contraception during the trial and for 3 months thereafter * In the Investigator's opinion, is able and willing to comply with all trial requirements. * Group A only: Participant is undergoing laparoscopic colorectal surgery * Group B only: Participant is undergoing laparoscopic donor nephrectomy Exclusion Criteria (Group A \& B participants) The participant may not enter the trial if ANY of the following apply: * Female participant who is pregnant, lactating or planning pregnancy throughout the trial. * Significant renal impairment (eGFR of under 50mL/min/1,73m2) * Significant liver impairment as defined as: * AST \> 3.0 x ULN or * ALT \> 3.0 x ULN or * Total serum bilirubin \> 1.5 x ULN * Participants involved with another research trial involving an unlicensed medicine in the past 12 weeks. * Any other significant disease or disorder which, in the opinion of the Investigator, may either put the participants at risk because of participation in the trial, or may influence the result of the trial, or the participant's ability to participate in the trial. * Known allergy to D-Mannitol or citric acid * Group B Only: Laparoscopic donor nephrectomy patients in whom the kidney recipient has refused participation or if the recipient is being transplanted in another transplant centre Inclusion criteria for transplant recipients * Participant must be willing and able to give informed consent for trial participation * Male or female aged 18 years or over * Is able and willing to comply with all trial requirements * Receiving a kidney from a participant recruited to this study Exclusion criteria for transplant recipients • Female who is pregnant, lactating, or planning pregnancy throughout the trial