Thanks, Marvin.
For the fourth quarter of 2023, total revenue increased 71.6% to $1,761,000 million from $1,026,000 during the fourth quarter of 2022. This increase was predominantly driven by the CE Mark recertification, which occurred subsequent to the end of the fourth quarter 2022 and overall growth in existing and new markets. Gross profit for the fourth quarter of 2023 increased by $307,000 or 155.1% to $505,000 compared to a gross profit of $198,000 for the fourth quarter of 2022. This increase resulted from higher revenue, offset by a decrease in miscellaneous expenses. Gross margin increased to 28.7% during the 3 months ended December 31, 2023, from 19.3% during the 3 months ended December 31, 2022.
Total operating expenses for the fourth quarter of 2023 were $6.3 million, an increase of $1.2 million or 23% compared to $5.1 million for the fourth quarter of 2022. This increase is primarily due to increases in expenses related to the salaries and share-based compensation, offset the reduction in clinical expenses as we near completion of the C-Guardians trial.
Total financial income for the fourth quarter of 2023 was $468,000, an increase of $349,000 or 293% compared to $119,000 for the fourth quarter of 2022. This increase was primarily due to $349,000 increase in interest income from investment in marketable securities, money market funds and short-term bank deposits.
Net loss for the fourth quarter of 2023 totaled $5.4 million or $0.16 per basic and diluted share compared to a net loss of $4.8 million or $0.60 per basic and diluted share for the same period in 2022. As of December 31, 2023, cash, cash equivalents, short-term bank deposits and marketable securities were $39 million compared to $17.8 million as of December 31, 2022.
That concludes our pre-prepared remarks, and we will now open the call for questions. Operator?