Clinical Pathology Services: Blood Chemistry and Hematology Analysis

Clinical pathology provides the systemic tolerability readout that accompanies efficacy and safety studies. Body weight and clinical observation detect that an animal is affected; clinical chemistry and hematology identify which organ systems are involved, frequently before any external sign appears. A transaminase elevation precedes visible hepatotoxicity, and a fall in neutrophil count precedes the clinical consequences of myelosuppression.

Altogen Labs provides blood chemistry and hematology analysis on samples collected during in vivo studies, integrated with histopathology so that a biochemical signal can be related to a tissue finding in the same animal. To discuss a clinical pathology panel, request a quote.

What the panels cover

Clinical chemistry assesses hepatic markers including transaminases and bilirubin, renal markers including urea and creatinine, electrolytes, glucose, total protein and albumin, and additional analytes selected for the compound class and the organ systems of concern.

Hematology covers red cell parameters, white cell count with differential, and platelet count. The differential frequently carries more information than the total count, since a normal total white cell count can conceal a substantial shift in composition, and neutrophil and lymphocyte responses to a treatment often move in opposite directions.

Interpretation requires the right comparison

A clinical pathology value is interpretable only against the right reference. Published reference ranges are a starting point, but they vary with strain, sex, age, fasting status, anesthetic, and collection site, and a study comparing treated animals against a published range rather than against concurrent controls will generate findings that are artifacts of those variables.

Concurrent control animals handled and sampled identically are therefore the primary comparison. Where baseline samples are available from the same animals, within-animal change is more sensitive than between-animal comparison, because it removes inter-individual variation from the analysis.

Collection variables that affect results

Pre-analytical variables affect clinical pathology results substantially. Collection site, anesthesia, fasting status, time of day, restraint stress, and the interval between collection and processing all shift measured values, several of them by more than a modest treatment effect would. Hemolysis during collection affects multiple chemistry analytes and cannot be corrected afterward.

Collection protocol is therefore fixed before the study opens and applied uniformly across groups, with sampling order randomized with respect to treatment group so that a systematic difference in collection time does not align with treatment assignment. Sample volume is tracked against species limits, particularly where serial sampling is combined with pharmacokinetic collection in the same animals.

Applications

Clinical pathology supports safety toxicology studies, dose range finding where it contributes to maximum tolerated dose determination, tolerability assessment within efficacy studies, and IND-enabling programs where it forms part of the standard safety package.

Applied examples

Dose selection. Interim clinical chemistry in a dose range finding study identifies hepatic enzyme elevation at the highest dose before body weight is affected, allowing the definitive study to select a dose below that threshold rather than discovering the problem at full scale.

Mechanism of tolerability. Weight loss in a treated group is investigated by hematology, with a marked neutrophil reduction identifying myelosuppression as the origin and directing subsequent monitoring and endpoint definition.

Correlation with tissue. A creatinine elevation is related to renal histopathology from the same animals, establishing whether the biochemical change has a structural correlate or reflects a functional or prerenal effect.

Panel definition and reporting

Panel composition, collection schedule, sample volumes, and reference comparison are defined in the protocol before initiation. Results are reported per animal with concurrent control values alongside, together with group summary statistics, since a group mean can conceal a substantial individual finding that is the most important result in the study. Values affected by hemolysis or insufficient sample are flagged rather than reported without qualification. All procedures are conducted under active IACUC protocols with sampling volumes and intervals defined for the species. GLP standards are applied where a study is formally designated as GLP.

Send study design, compound class, and organ systems of concern, or request a quote.