Estimate the time required for a measured protein concentration to double from two time-point results. The calculation uses exponential change and reports the implied rate and fold change, making it useful for kinetic expression experiments where the same assay and calibration are used at both times.
The result describes an exponential trend between two protein measurements; it does not prove continuous biological doubling throughout the interval.
Use consistent sample preparation, dilution correction, assay chemistry, and standard curves at both time points.
An increase from 0.5 to 2.0 mg/mL over 6 hours is a 4× change, equal to two doublings, so the estimated doubling time is 3 hours.
No. This exponential doubling-time calculation requires an ending concentration greater than the starting concentration. A decrease should be analyzed as decay or loss.
A change in assay, calibration, dilution correction, or reporting unit can look like biological growth and distort the calculated rate.
No. It summarizes the change between two points and assumes an exponential path; additional time points are needed to evaluate that assumption.
Yes, if the elapsed-time unit is treated consistently. The result will be in the same time unit entered even though the interface labels the default unit as hours.
The logarithmic growth rate is zero, so a finite doubling time cannot be calculated.
| Field | Meaning |
|---|---|
| Rate | Calculated output |
| Doublings | Calculated output |
| Fold \1Hange | Calculated output |